$A$ mass $M$,attached to a horizontal spring,executes $S.H.M.$ with amplitude $A_1$. When the mass $M$ passes through its mean position,a smaller mass $m$ is placed over it and both of them move together with amplitude $A_2$. The ratio of $\left( \frac{A_1}{A_2} \right)$ is

  • A
    $\left( \frac{M + m}{M} \right)^{\frac{1}{2}}$
  • B
    $\frac{M}{M + m}$
  • C
    $\frac{M + m}{M}$
  • D
    $\left( \frac{M}{M + m} \right)^{\frac{1}{2}}$

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